Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  *  linux/fs/affs/symlink.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  *  1995  Hans-Joachim Widmaier - Modified for affs.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  *  Copyright (C) 1991, 1992  Linus Torvalds
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  *  affs symlink handling code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include "affs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) static int affs_symlink_readpage(struct file *file, struct page *page)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	struct buffer_head *bh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 	struct inode *inode = page->mapping->host;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	char *link = page_address(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 	struct slink_front *lf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 	int			 i, j;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	char			 c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	char			 lc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 	pr_debug("get_link(ino=%lu)\n", inode->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	bh = affs_bread(inode->i_sb, inode->i_ino);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) 	if (!bh)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 		goto fail;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) 	i  = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) 	j  = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	lf = (struct slink_front *)bh->b_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	lc = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	if (strchr(lf->symname,':')) {	/* Handle assign or volume name */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 		struct affs_sb_info *sbi = AFFS_SB(inode->i_sb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		char *pf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 		spin_lock(&sbi->symlink_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 		pf = sbi->s_prefix ? sbi->s_prefix : "/";
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 		while (i < 1023 && (c = pf[i]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 			link[i++] = c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) 		spin_unlock(&sbi->symlink_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 		while (i < 1023 && lf->symname[j] != ':')
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) 			link[i++] = lf->symname[j++];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 		if (i < 1023)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 			link[i++] = '/';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 		j++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 		lc = '/';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 	while (i < 1023 && (c = lf->symname[j])) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 		if (c == '/' && lc == '/' && i < 1020) {	/* parent dir */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) 			link[i++] = '.';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) 			link[i++] = '.';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 		link[i++] = c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 		lc = c;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 		j++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) 	link[i] = '\0';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 	affs_brelse(bh);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) 	SetPageUptodate(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) 	unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) fail:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 	SetPageError(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) 	unlock_page(page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) 	return -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) const struct address_space_operations affs_symlink_aops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) 	.readpage	= affs_symlink_readpage,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) const struct inode_operations affs_symlink_inode_operations = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) 	.get_link	= page_get_link,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) 	.setattr	= affs_notify_change,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) };